Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger
Sign Up to like & getrecommendations! Published in 2018 at "Scientific Reports"
DOI: 10.1038/s41598-018-22880-y
Abstract: Bats of the Rhinolophidae and Hipposideridae families, and Pteronotus parnellii, compensate for Doppler shifts generated by their own flight movement. They adjust their call frequency such that the frequency of echoes coming from ahead fall… read more here.
Keywords: shift compensation; frequency; doppler; doppler shift ... See more keywords
Doppler shift in semi-Riemannian signature and the non-uniqueness of the Krein space of spinors
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Mathematical Physics"
DOI: 10.1063/1.5080525
Abstract: We give examples illustrating the fact that the different space/time splittings of the tangent bundle of a semi-Riemannian spin manifold give rise to non-equivalent norms on the space of compactly supported sections of the spinor… read more here.
Keywords: semi riemannian; doppler shift; space; shift semi ... See more keywords
Reversal of orbital angular momentum arising from an extreme Doppler shift
Sign Up to like & getrecommendations! Published in 2018 at "Proceedings of the National Academy of Sciences of the United States of America"
DOI: 10.1073/pnas.1720776115
Abstract: Significance The emergence of “negative” frequencies in physical systems is often accompanied by intriguing consequences. For example, supersonic motion between a source and an observer leads to a negative Doppler-shifted frequency, the physical meaning of… read more here.
Keywords: shift; reversal; angular momentum; doppler ... See more keywords
Toward Device-Free Micro-Gesture Tracking via Accurate Acoustic Doppler-Shift Detection
Sign Up to like & getrecommendations! Published in 2019 at "IEEE Access"
DOI: 10.1109/access.2018.2886279
Abstract: As a universal interaction method, hand and finger gestures can express people’s intention directly and clearly in daily life, and has been one of the hotspots in human–computer interaction community. In this paper, we present… read more here.
Keywords: finger; shift; device free; doppler shift ... See more keywords
Intermittently Nonlinear Impulsive Noise Mitigation and Doppler Shift Compensation in UWA-OFDM Systems
Sign Up to like & getrecommendations! Published in 2019 at "IEEE Access"
DOI: 10.1109/access.2019.2904010
Abstract: Impulsive noise (IN) and Doppler shift can significantly degrade the performance of orthogonal frequency-division multiplexing (OFDM)-based underwater acoustic (UWA) communication systems. In this paper, we propose a receiver structure that deals efficiently with both these… read more here.
Keywords: doppler; shift compensation; impulsive noise; doppler shift ... See more keywords
Doppler Shift Estimation for Space-Based AIS Signals Over Satellite-to-Ship Links
Sign Up to like & getrecommendations! Published in 2019 at "IEEE Access"
DOI: 10.1109/access.2019.2921915
Abstract: As a communication system for maritime monitoring and navigation, automatic identification system (AIS) has been employed for many years, but its service range is limited in 40 nautical miles. Fortunately, an updated service navigation system… read more here.
Keywords: shift; based ais; estimation; space based ... See more keywords
Acquisition of Time and Doppler Shift in WFRFT Encrypted Chaotic Direct Sequence Spread Spectrum System
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Access"
DOI: 10.1109/access.2022.3220891
Abstract: Weighted fractional Fourier transform encrypted chaotic direct sequence spread spectrum (WFRFT-CD3S) signal is aperiodic and complex Gaussian distributed. The aperiodicity and complex Gaussian distribution are conducive to the covert transmission of information but also make… read more here.
Keywords: chaotic direct; encrypted chaotic; doppler shift; sequence ... See more keywords
Sequential Doppler-Shift-Based Optimal Localization and Synchronization With TOA
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Internet of Things Journal"
DOI: 10.1109/jiot.2022.3150564
Abstract: Doppler shift is an important measurement for localization and synchronization (LAS), and is available in various practical systems. Existing studies on LAS techniques in a time-division broadcast LAS system (TDBS) only use sequential time-of-arrival (TOA)… read more here.
Keywords: doppler shift; localization synchronization; sequential doppler; las sdt ... See more keywords
A Semidefinite Relaxation Solution for Time Delay and Doppler Shift Localization Considering Sensor Location Errors and Its Bias Reduction Scheme
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Internet of Things Journal"
DOI: 10.1109/jiot.2022.3194897
Abstract: This article develops a robust source localization method using time delay and Doppler shift measurements, where the sensor motion effect accompanied by sensor location errors cannot be ignored. We begin by transforming the time delay… read more here.
Keywords: time delay; doppler shift; bias reduction; location errors ... See more keywords
Enabling OTFS-TSMA for Smart Railways mMTC Over LEO Satellite: A Differential Doppler Shift Perspective
Sign Up to like & getrecommendations! Published in 2023 at "IEEE Internet of Things Journal"
DOI: 10.1109/jiot.2022.3220844
Abstract: Recently, grant-free orthogonal time–frequency space-based tandem spreading multiple access (OTFS-TSMA) is proposed for machine-type communications (mMTCs) in smart railways environmental sensing. To achieve massive connections with scarce radio resources, OTFS-TSMA combines the advantages of OTFS… read more here.
Keywords: doppler shift; differential doppler; shift; smart railways ... See more keywords
Effects of Ocean Wave Directional Spectra on Doppler Retrievals of Ocean Surface Current
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Transactions on Geoscience and Remote Sensing"
DOI: 10.1109/tgrs.2021.3126327
Abstract: The Doppler shift of microwave radar signal is determined by the relative motion between radar and ocean surface, including contributions from the movement of the radar platform and the wind-wave-induced motion (phase velocity of the… read more here.
Keywords: surface current; doppler; doppler shift; ocean surface ... See more keywords